MRI Pelvis – Cervical Cancer Staging — Dictation, Appropriateness, and Dose for Residents
1. That One Critical Measurement: Staging Cervical Cancer on MRI
New consult from Gyn-Onc. A 42-year-old with a newly diagnosed cervical mass on exam. They’ve ordered the staging MRI, and your report will determine if she’s a candidate for surgery or heads straight to chemoradiation. The entire treatment pathway hinges on a few key measurements you’re about to make.
When I was a PGY-2 on the body service, I remember staring at that high-resolution T2 axial oblique, trying to decide if the cervical stromal ring was *really* broken or just attenuated. The entire case, the difference between Stage I/IIA and Stage IIB, comes down to that single call on parametrial invasion. Getting it right, and dictating it clearly, is everything. This guide is built to help you nail that read every time. For more guides like this, check out the residents and fellows resource hub.
2. What an MRI of the Pelvis for Cervical Cancer Staging Covers and What Attendings Look For
An MRI of the pelvis is the gold standard for local staging of cervical cancer. While clinical exam sets the initial stage, MRI provides the precise anatomical detail needed to refine it, guiding the Gyn-Onc team toward the optimal treatment strategy. It’s the definitive tool for assessing local tumor extent, which is the primary determinant of resectability.
Common indications for this study include:
- Initial pre-treatment staging of a known cervical cancer
- Monitoring response to therapy (e.g., chemoradiation)
- Evaluating for suspected local recurrence
- Assessing candidacy for fertility-sparing procedures like trachelectomy
- Planning for brachytherapy applicator placement
Your attending expects a comprehensive report that addresses the key questions for FIGO 2018 staging. Your findings section should systematically detail:
- The primary tumor: Its size in three dimensions, location, and signal characteristics.
- Parametrial invasion: The single most important finding. Is the low T2 signal cervical stromal ring intact or breached?
- Vaginal extension: Does the tumor extend into the vaginal fornices or down the vaginal wall? If so, how far?
- Adjacent organ invasion: Is there direct extension into the bladder or rectum?
- Lymph nodes: A thorough evaluation of pelvic (obturator, internal/external/common iliac) and para-aortic nodes.
- Hydronephrosis: Is there ureteral obstruction causing hydronephrosis? This automatically upstages the patient.
– Uterine body and internal os: Is the uterine corpus involved? What is the distance from the superior margin of the tumor to the internal os?
3. Radiology Report Template for MRI Pelvis – Cervical Cancer Staging
This template provides a solid framework. You can adapt it for your institution’s macros in PowerScribe or other dictation systems. The key is to be systematic so you don’t miss a critical finding.
Technique
Multiplanar, multisequence MRI of the pelvis was performed without and with intravenous administration of [X] mL of [macrocyclic gadolinium-based contrast agent]. Sequences included high-resolution T2-weighted images in the sagittal and oblique axial planes perpendicular to the endocervical canal, as well as coronal T2, large field-of-view axial T2, and diffusion-weighted imaging (DWI) with ADC mapping.
Findings
UTERUS: [Size, position, contour. Note any fibroids or adenomyosis.]
CERVIX:
- Primary Tumor: There is a [signal characteristics, e.g., T2-intermediate] mass centered in the [e.g., posterior lip of the ectocervix].
- Size: The tumor measures [AP] x [transverse] x [craniocaudal] cm.
- Parametrial Invasion: The low T2 signal cervical stromal ring is [intact / disrupted at the X o’clock position]. There is [no evidence of / clear evidence of] tumor extension into the parametrial fat.
- Vaginal Extension: The tumor extends into the [e.g., posterior vaginal fornix]. The distal extent is [X] cm from the external os. The lower third of the vagina is [spared / involved].
- Uterine Corpus Extension: There is [no / direct] extension into the uterine corpus. The distance from the superior tumor margin to the internal os is [X] mm.
ENDOMETRIUM: [Thickness, any fluid or mass.]
ADNEXA: Ovaries are [normal in appearance / describe findings]. No suspicious adnexal mass.
BLADDER: The bladder wall appears [intact / invaded by tumor].
RECTUM: The rectosigmoid colon appears [unremarkable / invaded by tumor].
LYMPH NODES: No enlarged or suspicious pelvic or para-aortic lymph nodes. [Or, describe suspicious nodes: location, size in short axis, morphology, and DWI signal.]
KIDNEYS/URETERS: There is [no / mild/moderate/severe] hydronephrosis on the [right/left] side, with the transition point at [level].
PELVIC BONES AND SOFT TISSUES: Unremarkable. No evidence of osseous metastasis.
Impression
Findings consistent with cervical carcinoma, measuring approximately [size] cm. Key findings for FIGO 2018 staging include:
- Tumor Size: [X] cm.
- Parametrial Invasion: [Present / Absent]. The cervical stromal ring is [disrupted / intact]. This suggests at least Stage [IBX / IIB] disease.
- Vaginal Involvement: [None / Upper 2/3 only / Lower 1/3]. This suggests at least Stage [IBX / IIA / IIIA] disease.
- Pelvic Sidewall / Hydronephrosis: [Absent / Present]. Hydronephrosis suggests at least Stage IIIB disease.
- Lymph Nodes: [No suspicious adenopathy / Suspicious pelvic/para-aortic nodes]. Suspicious nodes suggest at least Stage IIIC disease.
- Bladder/Rectal Invasion: [Absent / Present]. Invasion suggests Stage IVA disease.
The final stage will be determined by clinical and pathological correlation.
4. Free Template Sources for Radiology Residents
Before we get into AI-powered tools, it’s worth knowing that two great free repositories exist for community-sourced templates. They are excellent resources for building out your personal macro library, especially during residency.
- RadReport.org: Curated by the RSNA, this is a comprehensive library of peer-reviewed templates covering nearly every modality and subspecialty. (https://radreport.org/)
- Radiology Templates (AU): An Australian-maintained site with a clean interface and a strong collection of templates, often with helpful diagrams and notes. (https://www.radiologytemplates.com.au/home-page/)
5. The Next-Level Move: From Free-Form Dictation to Structured Report
The template above is a great starting point, but the real challenge on a busy service is translating your free-form observations into a perfectly structured report every time. When you dictate a series of positive findings—”4.2 cm cervical mass, looks like it’s breaking through the stroma at 3 o’clock, left-sided hydro, and a 1.2 cm obturator node that’s bright on DWI”—you still have to manually assemble that into a coherent impression with the correct staging implications.
This is where AI-driven tools can streamline your workflow. GigHz Precision AI is designed to take those free-form dictated findings and automatically generate a clean, structured report based on established frameworks like FIGO, LI-RADS, or Bosniak. It helps ensure all key measurements and staging criteria are included in the final impression, formatted the way your attendings expect. It’s about reducing the mental load of formatting so you can focus on the diagnostic task at hand.
6. When Should You Order an MRI of the Pelvis for Cervical Cancer Staging? ACR Appropriateness Criteria
The American College of Radiology (ACR) provides evidence-based guidelines to help clinicians choose the most appropriate imaging study. For cervical cancer, MRI is a cornerstone of evaluation.
According to the ACR Appropriateness Criteria for Pretreatment Evaluation and Follow-up of Invasive Cancer of the Cervix, an MRI of the pelvis is rated as Usually Appropriate for the initial local staging of any clinically visible lesion to assess tumor extension (T staging). It is the first-line modality for this indication.
For assessing lymph node and distant metastases (N/M staging), both PET/CT and MRI are considered Usually Appropriate. PET/CT is often preferred for evaluating distant disease, especially in more advanced cases.
MRI also plays a key role in post-treatment evaluation. It is Usually Appropriate for assessing treatment response after chemoradiation, where it excels at differentiating residual tumor from post-treatment fibrosis, especially with DWI. For evaluating known or suspected local recurrence, MRI is again rated as Usually Appropriate and is often the most sensitive imaging test.
7. MRI Pelvis for Cervical Cancer Staging Imaging Protocol — Sequences, Contrast, and Key Parameters
A high-quality staging MRI depends on a dedicated protocol with thin slices through the cervix. The goal is to maximize spatial resolution to clearly delineate the tumor margins and the integrity of the cervical stromal ring. The protocol typically includes high-resolution T2-weighted imaging in multiple planes, supplemented by DWI for tumor conspicuity and lymph node assessment.
The table below outlines a standard protocol. Note the importance of the thin-slice (3 mm) axial oblique T2 sequence, which should be planned perpendicular to the long axis of the endocervical canal on the sagittal images. This is your money shot for parametrial invasion.
| Sequence | Plane | Slice Thickness | Key Purpose |
|---|---|---|---|
| T2 High-Resolution | Sagittal | 3-4 mm | Tumor size, uterine/vaginal extension, distance to internal os |
| T2 High-Resolution | Axial Oblique | 3 mm | Critical for parametrial invasion (stromal ring) |
| T2 | Coronal | 4 mm | Relationship to pelvic sidewall, adnexa |
| T2 Large FOV | Axial | 5 mm | Full pelvic overview, lymph nodes, hydronephrosis |
| DWI/ADC | Axial | 4 mm | Tumor conspicuity, lymph node characterization, recurrence vs. fibrosis (b-values 0, 50, 800-1000) |
| T1 Fat-Sat Post-Contrast (Optional) | Axial/Coronal | 4-5 mm | Variable utility; can help delineate tumor margins or fistulas |
A common pitfall is incorrect planning of the axial oblique sequence. If the plane is not truly perpendicular to the endocervical canal, you can get volume averaging that either mimics or obscures a breach of the stromal ring. Always double-check your tech’s planning on the sagittal localizer before they run the sequence.
8. The 3-Months-Free Offer for Radiology Residents & Fellows
3+ months free for radiology residents and fellows
Look like a rockstar on your reports — dictate positive findings in free form, and the AI generates a structured report using ACR and SIR templates with the appropriate Clinical Decision Support (CDS) firing automatically. This is a chance to use a next-generation tool during your training to build great reporting habits.
All we ask is feedback so we can keep improving the product for trainees. The signup is simple. No credit card, no long forms. Just provide the following three items:
- Your PGY year (e.g., PGY-2, PGY-4)
- Your training type (radiology residency or specific fellowship)
- Your training program / hospital name
To get started, apply for the residents free-access program and reply to the application email with the information above.
9. Frequently Asked Questions (FAQ)
Is GigHz Precision AI HIPAA-compliant?
Yes. The platform is designed for de-identified workflows by default. No patient-identifying information (PHI) is required to use the tool for generating structured reports from your findings.
Do I need my hospital’s IT department to set this up?
No. GigHz Precision AI is browser-based and requires no local software installation. It works on any modern computer, including the PACS workstation or your personal laptop/iPad in the call room.
How does this work with PowerScribe or other dictation software?
It works alongside your existing dictation system. You can dictate your findings as you normally would, then use the AI-generated structured text to quickly build your final report, copying and pasting the structured impression directly into your RIS.
Can I customize the templates?
Yes. While the system comes pre-loaded with standard templates based on ACR and other society guidelines, you can create and save your own customized templates and macros to match your personal or institutional preferences.
What happens after my residency or fellowship ends?
The free access program is specifically for trainees. After you graduate, you can transition to a standard plan. We offer discounts for recent graduates to help you get started in your new role as an attending.
Free GigHz Tools That Pair With This Article
Three free tools that complement the material above:
- ACR Appropriateness Criteria Lookup — Type an indication or clinical scenario in plain language and get the imaging studies the ACR rates for it, with adult and pediatric radiation levels. Built directly from 297 ACR topics, 1,336 clinical variants, and 15,823 procedure ratings.
- GigHz Imaging Protocol Library — A searchable library of 131 imaging protocols with the physics specs surfaced and the matching ACR Appropriateness Criteria alongside. Plain-English narratives readable in 60 seconds, organized by modality.
- GigHz Radiation Dose Calculator — Pick the imaging studies a patient has had and see total dose in millisieverts (mSv) with comparisons to natural background radiation, transatlantic flights, and chest X-rays. Useful for shared decision-making.
Reviewed by Pouyan Golshani, MD, Interventional Radiologist — May 7, 2026
